Bound Bogoliubov quasiparticles in photon superfluids

Year: 2024

Authors: Ciszak M., Marino F.

Autors Affiliation: CNR, Ist Nazl Ottica, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; INFN, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.

Abstract: Bogoliubov’s description of Bose gases relies on the linear dynamics of noninteracting quasiparticles on top of a homogeneous condensate. Here, we theoretically explore the weakly nonlinear regime of a onedimensional photon superfluid in which phononlike elementary excitations interact via their backreaction on the background flow. The generalized dispersion relation extracted from spatiotemporal intensity spectra reveals additional branches that correspond to bound Bogoliubov quasiparticles-phase-locked collective excitations originating from nonresonant harmonic generation and wave-mixing processes. These mechanisms are inherent to fluctuation dynamics and highlight nontrivial scattering channels other than resonant interactions that could be relevant in the emergence of dissipative and turbulent phenomena in superfluids.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 6 (3)      Pages from: L032006-1  to: L032006-7

KeyWords: Bose-einstein Condensate; Dispersion; Gases
DOI: 10.1103/PhysRevResearch.6.L032006